Add note for default namespace (redhat-ai-dev#56)

Signed-off-by: thepetk <[email protected]>

Author: thepetk

README.md

@@ -101,4 +101,8 @@ export PATH="/opt/homebrew/opt/gnu-sed/libexec/gnubin:$PATH"
 
 If you encounter images within TechDocs not properly rendering on Red Hat Developer Hub you may need to ensure they are located in a sub-directory named `/images` within `/docs`. 
 
-For example: `/docs/images`.
+For example: `/docs/images`.
+
+### Using "default" Namespace for AI Software Templates
+
+Note, that as the `"default"` Namespace has specific permissions, choosing this Namespace to deploy your AI Software Templates applications is not supported.